Shift-tolerance Property of Optical Security System using Phase-based Virtual Image

The shift-tolerance property of the encrypted image or the Fourier decrypting key in the Fourier space is proposed based on a phase-encoded virtual image. The encrypted data is obtained by the Fourier transform of the product of a phase-encoded virtual image to camouflage the original one and a random phase image. Therefore, even if unauthorized users analyze the encrypted image, they cannot reconstruct the required image. This virtual image protects the original one from being counterfeited and from unauthorized access. We demonstrate the robustness to data loss and shift of the encrypted data or the Fourier decrypting key in the proposed decryption technique using an interferometer.     

利用宇宙线对BESⅢ量能器CsⅠ（Tl）晶体探测器单元的测量

利用宇宙射线进行探测器模型的性能测试是高能物理普遍采用的方法，其中最重要的步骤之一就是确定宇宙线入射的准确位置和径迹．多数采用丝室探测器来进行宇宙线的精确定位，需要很高的造价和复杂的电子学系统．本文介绍一种简单的定位方法，采用塑料闪烁体条加波移剂光纤编码读出的方式，可以实现精度为1cm的定位．据此建立了一套实验装置，对BESⅢ电磁量能器CsⅠ（Tl）晶体探测器单元的光输出强度和不均匀性进行了测量．     

基于光学相关的红外目标检测

光学图像处理技术能以复振幅、并行、高速度和巨量互连来处理信号。利用光学方法的半色调网屏技术实现了红外图像的假彩色编码,提高了红外图像的可识别性;利用光学相关识别技术构造了一种基于4f系统的光学图像实时相关识别系统,以实现对红外图像的实时处理和识别。     

光源编码的白光散斑剪切干涉计量术

本文提出了一种用非相干光源照明进行剪切干涉计量的方法—光源编码的白光散斑剪切干涉计量术.它采用光栅对光源进行编码以提高空间相干性,使物体的两个剪切像的波面部分相干叠加,以实现剪切干涉.     

All-optical method of developing a phase encoded latch by using EDFA

Optics has already proved its meaningful application in information processing and computation, where the parallelism of light is exploited to achieve the desired result. In this communication a novel concept of all-optical memory unit based on phase encoding process is proposed. The unit is simple in architecture comprising phase sifters, mirrors (M′) and two blocks of Erbium doped fiber amplifier. The optical feedback is supported by use of beam splitters and mirrors. It is independent of intensity and therefore requires a small switching power and can work at a bit rate far above 100 Gb/s.     

Spin-spin coupling edition in chiral liquid crystal NMR solvent

The application of the G-SERFph pulse sequence is presented on enantiomeric mixtures dissolved in a chiral liquid crystal. It aims at editing, within one single 2D spectrum, every proton coupling which is experienced by a given proton site in the molecule, and leads to real phased T-edited spectroscopy (T=J+2D). This NMR experiment is based on the combination of homonuclear semi-selective refocusing techniques with a spatial frequency encoding of the sample. This approach, which consists in handling selectively each coupling in separate cross sections of the sample, is applied to the visualization of enantiomers dissolved in a chiral liquid crystalline phase. Advantages and limits of this methodology are widely discussed.     

掺铒光纤激光器反相位混沌同步及其编码

针对单模双环掺铒光纤激光器具有光耦合相互作用的非线性动力学特点,应用“交叉注入反相位双环对两环主动—被动”混沌同步方法,数值模拟实现了两组相互独立的单模单环掺铒光纤激光器激光分别和单模双环掺铒光纤激光器对应环激光混沌同步;提出并数值模拟了具有调制频率1kHz和15kHz的正弦信号的双环—两环的两路混沌隐藏编码保密通信系统,它们解码质量好,保密性能强,可以很好地应用在混沌多路保密通信中。     

TOCM彩色摄影技术用于大学物理实验的研究

经过多年的发展，采用全光彩色调制器进行彩色摄影的技术已经相当成熟．作为大专院校的学生，有必要了解这一领域的研究成果．为此，开设了TOCM彩色摄影实验，本文介绍了该实验的原理和实验内容．     

双通道编码高速存储系统设计

航天事业对存储系统的存储速度及保密性的要求在不断提高,针对这些要求提出了双通道编码高速存储系统的设计。设计了一种以RS-422和LVDS为通信手段,双端口RAM为缓存介质,双片选交替双平面混编存储为技术,混合编码存储为特点,K9WBG08U1M芯片为存储核心的高速、大容量的存储系统。双通道编码高速存储系统解决了双路数据存储速率低的问题。最后,对系统采集的数据进行科学分析及图像还原,验证了高速存储系统的可靠性。     

三维成像中相位级次自编码的相位测量方法

提出一种相位级次自编码技术的相位测量方法.与传统的相位测量技术不同,该方法利用截断相位的微分值作为编码通道,完成对各条纹级次的编码.构造的代码序列总长度为投影条纹的周期数,每个周期作为一个码元,由相邻若干码元构成一个代码子序列.相位计算后,根据截断相位的微分信息,可以提取出各周期及其码元值,通过在设计的代码序列中进行代...